libp2p-nat 0.4.0

(WIP) Implementation of port forwarding for libp2p
Documentation 
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use std::net::{IpAddr, Ipv4Addr, Ipv6Addr, SocketAddr, SocketAddrV4};

use igd_next::PortMappingProtocol;
use libp2p::{multiaddr::Protocol, Multiaddr};

use crate::task::QuicType;

#[allow(clippy::upper_case_acronyms)]
#[derive(Debug, Copy, Clone, Eq, PartialEq, Hash)]
pub enum MappingProtocol {
    TCP,
    UDP,
}

#[cfg(feature = "nat_pmp_fallback")]
#[cfg(not(target_os = "ios"))]
impl From<natpmp::Protocol> for MappingProtocol {
    fn from(protocol: natpmp::Protocol) -> Self {
        match protocol {
            natpmp::Protocol::TCP => MappingProtocol::TCP,
            natpmp::Protocol::UDP => MappingProtocol::UDP,
        }
    }
}

impl From<PortMappingProtocol> for MappingProtocol {
    fn from(protocol: PortMappingProtocol) -> Self {
        match protocol {
            PortMappingProtocol::TCP => MappingProtocol::TCP,
            PortMappingProtocol::UDP => MappingProtocol::UDP,
        }
    }
}

impl From<MappingProtocol> for PortMappingProtocol {
    fn from(protocol: MappingProtocol) -> Self {
        match protocol {
            MappingProtocol::TCP => PortMappingProtocol::TCP,
            MappingProtocol::UDP => PortMappingProtocol::UDP,
        }
    }
}

#[cfg(feature = "nat_pmp_fallback")]
#[cfg(not(target_os = "ios"))]
impl From<MappingProtocol> for natpmp::Protocol {
    fn from(protocol: MappingProtocol) -> Self {
        match protocol {
            MappingProtocol::TCP => natpmp::Protocol::TCP,
            MappingProtocol::UDP => natpmp::Protocol::UDP,
        }
    }
}

pub(crate) fn multiaddr_to_socket_port(
    addr: &Multiaddr,
) -> Option<(SocketAddr, MappingProtocol, Option<QuicType>)> {
    let mut iter = addr.iter();
    let mut addr = iter.next().and_then(|proto| match proto {
        Protocol::Ip4(addr) if addr.is_private() => {
            Some(SocketAddr::V4(SocketAddrV4::new(addr, 0)))
        }
        // Protocol::Ip6(addr)
        //     if !addr.is_loopback()
        //         && (addr.segments()[0] & 0xffc0) != 0xfe80
        //         && (addr.segments()[0] & 0xfe00) != 0xfc00 =>
        // {
        //     Some(SocketAddr::V6(SocketAddrV6::new(addr, 0, 0, 0)))
        // }
        _ => None,
    })?;

    let (protocol, port) = iter.next().and_then(|proto| match proto {
        Protocol::Tcp(port) => Some((MappingProtocol::TCP, port)),
        Protocol::Udp(port) => Some((MappingProtocol::UDP, port)),
        _ => None,
    })?;

    let quic_type = iter.next().and_then(|proto| match proto {
        Protocol::Quic => Some(QuicType::Draft29),
        Protocol::QuicV1 => Some(QuicType::V1),
        _ => None,
    });

    addr.set_port(port);

    Some((addr, protocol, quic_type))
}

pub enum IpOrSocket {
    Socket(SocketAddr),
    Ip(IpAddr, u16),
}

impl From<SocketAddr> for IpOrSocket {
    fn from(socket: SocketAddr) -> Self {
        IpOrSocket::Socket(socket)
    }
}

impl From<(IpAddr, u16)> for IpOrSocket {
    fn from((ip, port): (IpAddr, u16)) -> Self {
        IpOrSocket::Ip(ip, port)
    }
}

impl From<(Ipv4Addr, u16)> for IpOrSocket {
    fn from((ip, port): (Ipv4Addr, u16)) -> Self {
        IpOrSocket::Ip(ip.into(), port)
    }
}

impl From<(Ipv6Addr, u16)> for IpOrSocket {
    fn from((ip, port): (Ipv6Addr, u16)) -> Self {
        IpOrSocket::Ip(ip.into(), port)
    }
}

pub(crate) fn to_multipaddr<IS: Into<IpOrSocket>>(
    addr: IS,
    proto: MappingProtocol,
    quic_opt: Option<QuicType>,
) -> Multiaddr {
    let (ip, port) = match addr.into() {
        IpOrSocket::Socket(socket) => (socket.ip(), socket.port()),
        IpOrSocket::Ip(ip, port) => (ip, port),
    };
    let mut multiaddr = Multiaddr::empty();
    match ip {
        IpAddr::V4(ip) => multiaddr.push(Protocol::Ip4(ip)),
        IpAddr::V6(ip) => multiaddr.push(Protocol::Ip6(ip)),
    }

    match proto {
        MappingProtocol::TCP => multiaddr.push(Protocol::Tcp(port)),
        MappingProtocol::UDP => multiaddr.push(Protocol::Udp(port)),
    }

    if let Some(option) = quic_opt {
        assert!(multiaddr
            .iter()
            .any(|proto| matches!(proto, Protocol::Udp(_))));

        multiaddr.push(option.into());
    }

    multiaddr
}